sysdeps/sh/crti.S

   1 /* Special .init and .fini section support for SH.
   2    Copyright (C) 2000-2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    In addition to the permissions in the GNU Lesser General Public
  11    License, the Free Software Foundation gives you unlimited
  12    permission to link the compiled version of this file with other
  13    programs, and to distribute those programs without any restriction
  14    coming from the use of this file. (The GNU Lesser General Public
  15    License restrictions do apply in other respects; for example, they
  16    cover modification of the file, and distribution when not linked
  17    into another program.)
  18
  19    Note that people who make modified versions of this file are not
  20    obligated to grant this special exception for their modified
  21    versions; it is their choice whether to do so. The GNU Lesser
  22    General Public License gives permission to release a modified
  23    version without this exception; this exception also makes it
  24    possible to release a modified version which carries forward this
  25    exception.
  26
  27    The GNU C Library is distributed in the hope that it will be useful,
  28    but WITHOUT ANY WARRANTY; without even the implied warranty of
  29    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30    Lesser General Public License for more details.
  31
  32    You should have received a copy of the GNU Lesser General Public
  33    License along with the GNU C Library; if not, write to the Free
  34    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  35    02111-1307 USA.  */
  36
  37 /* crti.S puts a function prologue at the beginning of the .init and
  38    .fini sections and defines global symbols for those addresses, so
  39    they can be called as functions.  The symbols _init and _fini are
  40    magic and cause the linker to emit DT_INIT and DT_FINI.  */
  41
  42 #include <libc-symbols.h>
  43 #include <sysdep.h>
  44
  45 #ifndef PREINIT_FUNCTION
  46 # define PREINIT_FUNCTION __gmon_start__
  47 #endif
  48
  49 #ifndef PREINIT_FUNCTION_WEAK
  50 # define PREINIT_FUNCTION_WEAK 1
  51 #endif
  52
  53 #if PREINIT_FUNCTION_WEAK
  54         weak_extern (PREINIT_FUNCTION)
  55 #else
  56         .hidden PREINIT_FUNCTION
  57 #endif
  58
  59         .section        .init,"ax",@progbits
  60         .align 5
  61         .global _init
  62         .type   _init, @function
  63 _init:
  64         mov.l   r12,@-r15
  65         mova    .L12,r0
  66         mov.l   .L12,r12
  67         mov.l   r14,@-r15
  68         add     r0,r12
  69         sts.l   pr,@-r15
  70 #if PREINIT_FUNCTION_WEAK
  71         mov.l   .L13,r0
  72         mov.l   @(r0,r12),r1
  73         tst     r1,r1
  74         bt/s    .L8
  75         mov     r15,r14
  76         mov.l   .L14,r1
  77         bsrf    r1
  78 .LPCS0:
  79         nop
  80 .L8:
  81 #else
  82         mova    .L13,r0
  83         mov.l   .L13,r1
  84         add     r0,r1
  85         jsr     @r1
  86         mov    r15,r14
  87 #endif
  88         bra     1f
  89         nop
  90         .align 2
  91 .L12:
  92         .long   _GLOBAL_OFFSET_TABLE_
  93 #if PREINIT_FUNCTION_WEAK
  94 .L13:
  95         .long   PREINIT_FUNCTION@GOT
  96 .L14:
  97         .long   PREINIT_FUNCTION@PLT-(.LPCS0+2-(.))
  98 #else
  99 .L13:
 100         .long   PREINIT_FUNCTION@PLT
 101 #endif
 102 1:
 103
 104         .section        .fini,"ax",@progbits
 105         .align 5
 106         .global _fini
 107         .type   _fini, @function
 108 _fini:
 109         mov.l   r12,@-r15
 110         mova    .L19,r0
 111         mov.l   r14,@-r15
 112         sts.l   pr,@-r15
 113         mov.l   .L19,r12
 114         mov     r15,r14
 115         add     r0,r12
 116         bra     0f
 117         nop
 118         .align 2
 119 .L19:
 120         .long   _GLOBAL_OFFSET_TABLE_
 121 0: